This gives me a DataGrid with a coloumn of CheckBoxs at the front.
Now what i'm looking for is a way to select multiple Rows and click on one CheckBox, and then the CheckBoxes in all selected Rows get checked.

1 Answer
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I had to solve this exact problem recently using the DevExpress WPF GridControl. There doesn't seem to be an out-of-the-box way to do this for either grid.

I used the PreviewKeyDown event on the column to detect a Space key press. I would then iterate over all selected cells and set their value to the focused cell value. It gave the desired outcome and I guess you could do something similar using the PreviewMouseUp event instead.